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Old 11-21-2018, 02:58 PM   #31
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Does anyone know yet if they used a smaller battery in the PW4? That might explain a slightly shorter battery life.
PW3 = 1420mAh / 5.25Wh
PW4 = 1500mAh / 5.7Wh
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Old 11-21-2018, 03:27 PM   #32
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That's the thing. Afaik, Amazon used a slightly larger battery on the PW4 (1500 mAh) vs PW3 (1420 mAh?).
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Originally Posted by AnemicOak View Post
PW3 = 1420mAh / 5.25Wh
PW4 = 1500mAh / 5.7Wh
Well, so much for my "slightly smaller battery" theory. Maybe the extra LED is causing a bit faster battery drain?
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Old 11-21-2018, 03:35 PM   #33
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Well, so much for my "slightly smaller battery" theory. Maybe the extra LED is causing a bit faster battery drain?
Quite possible but surely that shouldn't affect standby/sleep?
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Old 11-21-2018, 05:06 PM   #34
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I am the OP.
Expectations have pitfalls. So do comparisons such as comparing my new Paperwhite with my 2013 Paperwhite (cost $0) which had dramatically better battery life than my new one
(cost $249). This is another First World problem for me. Thanks for the suggestions.
I assume those prices are American dollars and you got the model with cellular communication. You mention turning off WiFi, did you turn off the cellular modem as well?
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Old 11-21-2018, 06:21 PM   #35
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Kindles with cellular and wifi have airplane mode, and airplane mode disabled. That's it.

If a known wifi is present with airplane mode disabled, that will be used, otherwise cellular wil;l be attempted.
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Old 11-21-2018, 08:21 PM   #36
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Quite possible but surely that shouldn't affect standby/sleep?
Alright, I'll quit guessing. I hope the issue, if it's fairly major, is found and corrected. I think I, personally, would be more tempted to get the PW3, mostly because I like the darker text. But, if it has better battery life, that would be another plus.
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Old 11-22-2018, 04:34 AM   #37
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Amazon say:







So that works out at 6 x 7 x 0.5 = 21h reading time, which sounds pretty much on a par with what you’re getting.


Thanks HarryT! I’m a newbie in this e-reader stuff, and still deciding which one to buy.
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Old 11-25-2018, 08:28 AM   #38
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Hey guys i'm worried about battery too. PW4 arrived just friday, i updated jailbreaked, put all my books from calibre, charged until the led was green (oddly the percentage indicated was 96%. from that point i just made some test with the light, read not more than 2-3 hours i think, "played with it" a bit (i mean, tried all kind of stuff). i used wifi intermittently (doesn't have it at home , i use the hotspot from my phone), no BT and light to read always at <10. Right now i'm at 65%... WTH? Coming from a K4, i mean i know that was without light and the system was really basic and everything, but i actually never worried about battery there... at least 2-3 weeks of use or even a month without problem... Is this about the high percentage coming down faster perhaps? i don't use wifi but i don't use airplane mode (just cause i don't like the icon xd), that drain battery (i i did the same thing with my K4)? never shut down the screen too, always on simple standby but i thought that basically doesn't use battery.
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Old 11-25-2018, 09:04 AM   #39
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Just read about indexing... oddly it doesn't seem the case. i just added like 200 books. If i do a research with "." nothing comes out, not any indication that says "X books are still indexing, just "no results". right now it is at 62%, so 3% in... 30 minutes? i'm swiping everywhere but i don't even have the light on. What do you think? should i try to do again a full recharge?
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Old 11-25-2018, 09:09 AM   #40
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Just read about indexing... oddly it doesn't seem the case. i just added like 200 books. If i do a research with "." nothing comes out, not any indication that says "X books are still indexing, just "no results".
Are you sure that on the "No Results" page, the "Text in Books" tab is not enabled? That's where you'll see the number of books remaining to be indexed.
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Old 11-25-2018, 11:46 AM   #41
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Are you sure that on the "No Results" page, the "Text in Books" tab is not enabled? That's where you'll see the number of books remaining to be indexed.
I'm pretty sure, right now i'm sure (text in books is 0 and not enabled like dictionary or wikipedia). Since that text it's still 62... I'm thinking to do a full recharge, and see the results tonight after my 1-2 hours of reading
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Old 11-25-2018, 11:52 AM   #42
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I just compared battery drain on my PW3-4GB wifi (5.10.1.1) and PW4-32GB wifi (5.10.1.2), wifi on, brightness set to 6, Bookerly, size 5.

I read three ~10K word chapters (I was doing my reading on the PW3 and just turned the pages on PW simultaneously). Drain was 3% on both devices and the occasional check does seem to support ~1% per chapter. Alas, I didn't take note of the time I started so no idea how long I read for.

As for charging, do note that even Androids and iPhones show full charge when they reach 95% and just do trickle charging so as to extend battery longevity. Leave it overnight or something and it'll get to 100% eventually.
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Old 11-25-2018, 12:01 PM   #43
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P.S. It's possible that newer firmware drains battery more quickly than older ones. Alas, that one's more difficult to measure given there's no battery percentage display on older firmware.
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Old 11-25-2018, 12:36 PM   #44
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P.S. It's possible that newer firmware drains battery more quickly than older ones. Alas, that one's more difficult to measure given there's no battery percentage display on older firmware.
Yes battery percentage actually makes me a little anxious anyway starting tonight i'll start to monitor the battery percentage then i'll report here. It's possible that it goes down from full to 65 cause the indexing, i hope so.
Anyway i think i can't expect to reach my old kindle given that it has an older firmware, no light and 1800 mAh against the 1500 of PW4

Should i put the kindle in airplane mode, even if i'm not actually connected to any wifi ?
Last edited by kript96; 11-25-2018 at 12:38 PM.
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Old 11-25-2018, 01:00 PM   #45
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Yes, switching on airplane mode will significantly reduce power consumption.
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